Enhanced geothermal systems and reservoir optimization
Systems and methods can include maximizing energy recovery from a subterranean formation. According to one embodiment, a selected subterranean open-hole interval is isolated and at least one fracture is stimulated in the isolated subterranean open-hole interval.
1. A method for recovering thermal energy from a subterranean formation comprising:
pressurizing at least one unstimulated fracture within an unisolated subterranean open-hole interval to create a first stimulated fracture;
isolating a selected subterranean open-hole interval by blocking the first stimulated fracture with a temporary fracture sealant, wherein the temporary fracture sealant thermally degrades at geostatic temperatures; and
pressurizing at least one unstimulated fracture within the isolated subterranean open-hole interval to create a second stimulated fracture, wherein a water is circulated within the second stimulated fracture to be heated and produced from the well for generating electricity.
2. The method as recited in claim 1 , wherein isolating the selected subterranean open-hole interval comprises positioning an isolation tool adjacent to the selected subterranean open-hole interval.
3. The method as recited in claim 2 , wherein pressurizing the at least one unstimulated fracture within the isolated subterranean open-hole interval comprises injecting a treatment fluid down a tubing string.
4. The method as recited in claim 3 , further comprising pressurizing the at least one unstimulated fracture in the unisolated subterranean open-hole interval by injecting the treatment fluid down an annulus between the tubing string and the unisolated subterranean open-hole interval.
5. The method as recited in claim 4 , wherein the isolation tool is a high temperature inflatable open-hole packer.
6. The method as recited in claim 4 , wherein the isolation tool is a high temperature expandable open-hole packer comprising an expandable element and a sealing element.
7. The method as recited in claim 1 , wherein isolating the selected subterranean open-hole interval comprises positioning a scab liner proximate the selected subterranean open-hole interval.
8. The method as recited in claim 7 , wherein pressurizing the at least one unstimulated fracture within the isolated subterranean open-hole interval comprises injecting a treatment fluid down a tubing string.
9. The method as recited in claim 8 , further comprising pressurizing the at least one unstimulated fracture in the unisolated subterranean open-hole interval by injecting the treatment fluid down an annulus between the tubing string and the unisolated subterranean open-hole interval.
10. The method as recited in claim 1 , wherein pressurizing the at least one unstimulated fracture in the isolated subterranean open-hole interval comprises projecting treatment fluid from a high pressure jet nozzle against the isolated subterranean open-hole interval.
11. The method as recited in claim 10 , wherein the treatment fluid comprises a granular material.
12. The method as recited in claim 1 , wherein isolating the selected subterranean open-hole interval comprises at least partially filling at least one fracture in the unisolated subterranean open-hole interval with a high viscosity fluid.
13. The method as recited in claim 1 , further comprising detecting a stimulation of fractures real-time with a micro-seismic monitoring system.
14. The method as recited in claim 1 , further comprising detecting a downhole parameter realtime.
15. The method as recited in claim 14 , wherein the downhole parameter is at least one of pressure of the selected open-hole interval, temperature of the selected open-hole interval, the flow rate of the treatment fluid in the selected open-hole interval, the flow pattern of treatment fluid in the selected open-hole interval, the flow rate of the treatment fluid in a fracture in the selected open-hole interval and the flow pattern of the treatment fluid in a fracture in the selected open-hole interval.